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    <title>
        Bootstrap 101 Template
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    <style>
        a:focus { outline: 0; }
        body {
            padding-top: 50px;
            padding-bottom:40px;
            color: #5a5a5a;
        }
        /* 轮播广告*/
        .carousel {
            height: 500px;
            background-color: #000;
            margin-bottom: 60px;
        }

        .carousel .item {
            height: 500px;
            background-color: #000;
        }

        .carousel img {
            width: 100%;
        }

        .carousel-caption p {
            margin-bottom: 20px;
            font-size: 20px;
            line-height: 1.8;
        }

        .summary{
            padding-left: 15px;
            padding-right: 15px;
        }
        .summary .col-md-4 {
            text-align: center;
        }

        /*特性*/
        .feature{
            padding:30px 0;
        }
        .feature-divider {
            margin: 40px 0;
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        .feature-heading {
            font-size: 50px;
            color: #2a6496;
        }

        .feature-heading .text-muted {
            font-size: 28px;
        }


        /*响应式布局*/
        @media (max-width: 769px){
            .summary {
                padding-right: 3px;
                padding-left: 3px;
            }

            .carousel {
                height: 300px;
                margin-bottom: 30px;
            }

            .carousel .item {
                height: 300px;
            }

            .carousel img {
                min-height: 300px;
            }

            .carousel-caption p {
                font-size: 16px;
                line-height: 1.4;
            }

            .feature-heading {
                font-size: 34px;
            }
            .feature-heading .text-muted {
                font-size: 22px;
            }
        }

        @media (min-width: 992px) {
            .feature-heading {
                margin-top: 120px;
            }
        }

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<body>
<!-- 顶部导航-->
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation" id="menu-nav">
    <div class="container">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button class="navbar-toggle collapsed" data-target="#bs-example-navbar-collapse-1" data-toggle="collapse"
                    type="button">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">现代浏览器博物馆</a>
        </div>
        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#ad-carousel">综述</a></li>
                <li><a href="#summary-container">简述</a></li>
                <li class="dropdown">
                    <a class="dropdown-toggle" data-toggle="dropdown" href="#">
                        特点<span class="caret"></span>
                    </a>
                    <ul class="dropdown-menu" role="menu">
                        <li><a href="#tab-chrome">Chrome</a></li>
                        <li><a href="#tab-firfox">Firefox</a></li>
                        <li><a href="#tab-safari">Safari</a></li>
                        <li><a href="#tab-opera">Opera</a></li>
                        <li><a href="#tab-ie">IE</a></li>
                    </ul>
                </li>
                <li><a data-toggle="modal" data-target="#about-modal" href="#">关于</a></li>
            </ul>
        </div>
        <!-- /.navbar-collapse -->
    </div>
    <!-- /.container -->
</nav>

<!-- 图片轮播-->
<div id="ad-carousel" class="carousel slide" data-ride="carousel">
    <!-- Indicators -->
    <ol class="carousel-indicators">
        <li class="active" data-slide-to="0" data-target="#ad-carousel"></li>
        <li data-slide-to="1" data-target="#ad-carousel"></li>
        <li data-slide-to="2" data-target="#ad-carousel"></li>
        <li data-slide-to="3" data-target="#ad-carousel"></li>
        <li data-slide-to="4" data-target="#ad-carousel"></li>
    </ol>
    <!-- Wrapper for slides -->
    <div class="carousel-inner" role="listbox">
        <div class="item active">
            <img alt="0" src="images/chrome-big.jpg">
            <div class="carousel-caption">
                <h1>Chrome</h1>
                <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器</p>
                <p><a class="btn btn-primary btn-lg" href="#" target="_blank">点我下载</a></p>
            </div>
            </img>
        </div>
        <div class="item">
            <img alt="..." src="images/firefox-big.jpg">
            <div class="carousel-caption">
                <h1>Firefox</h1>
                <p>Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
                <p><a class="btn btn-primary btn-lg" href="#" target="_blank">点我下载</a></p>
            </div>
            </img>
        </div>
        <div class="item">
            <img alt="..." class="img-responsive" src="images/safari-big.jpg">
            <div class="carousel-caption">
                <h1>Safari</h1>
                <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
                <p><a class="btn btn-primary btn-lg" href="#" target="_blank">点我下载</a></p>
            </div>
            </img>
        </div>
        <div class="item">
            <img alt="..." src="images/opera-big.jpg">
            <div class="carousel-caption">
                <h1>Opera</h1>
                <p>Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。</p>
                <a class="btn btn-primary btn-lg" href="#" target="_blank">点我下载</a>
            </div>
            </img>
        </div>
        <div class="item">
            <img alt="..." src="images/ie-big.jpg">
            <div class="carousel-caption">
                <h1>IE</h1>
                <p>Internet Explorer，简称 IE，是微软公司推出的一款网页浏览器。</p>
                <p><a class="btn btn-primary btn-lg" href="#" target="_blank">点我下载</a></p>
            </div>
            </img>
        </div>
    </div>
    <!-- Controls -->
    <a class="left carousel-control" data-slide="prev" href="#ad-carousel" role="button">
            <span class="glyphicon glyphicon-chevron-left"></span>
            <span class="sr-only">Previous</span>
    </a>
    <a class="right carousel-control" data-slide="next" href="#ad-carousel" role="button">
            <span class="glyphicon glyphicon-chevron-right"></span>
            <span class="sr-only">Next</span>
    </a>
</div>

<!--主要内容-->
<div class="container summary" >

    <!--三栏布局-->
    <div class="row" id="summary-container">
        <div class="col-md-4">
            <img alt="" class="img-circle" src="images/chrome-logo-small.jpg">
            <h2>Chrome</h2>
            <p>Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。</p>
            <p><a class="btn btn-default" href="#">点我下载</a></p>
        </div>
        <div class="col-md-4">
            <img alt="" class="img-circle" src="images/firefox-logo-small.jpg">
            <h2> Firefox</h2>
            <p> Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器。</p>
            <p><a class="btn btn-default" href="#">点我下载</a></p>
        </div>
        <div class="col-md-4">
            <img alt="" class="img-circle" src="images/safari-logo-small.jpg">
            <h2>Safari
            </h2>
            <p>Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器。</p>
            <p><a class="btn btn-default" href="#">点我下载</a></p>
            </img>
        </div>
    </div>

    <!--分割线-->
    <hr class="feature-divider">


    <!-- 详细介绍 -->
    <ul class="nav nav-tabs" role="tablist">
        <li class="active" role="presentation"><a data-toggle="tab" href="#tab-chrome" role="tab">Chrome</a></li>
        <li role="presentation"><a data-toggle="tab" href="#tab-firfox" role="tab">Firefox</a></li>
        <li role="presentation"><a data-toggle="tab" href="#tab-safari" role="tab">Safari</a></li>
        <li role="presentation"><a data-toggle="tab" href="#tab-opera" role="tab">Opera</a></li>
        <li role="presentation"><a data-toggle="tab" href="#tab-ie" role="tab">IE</a></li>
    </ul>
    <!-- Tab panes -->
    <div class="tab-content">
        <div class="tab-pane active" id="tab-chrome" role="tabpanel">
            <div class="row feature">
                <div class="col-md-7">
                    <h2 class="feature-heading">Google Chrome<span class="text-muted">使用最广的浏览器</span></h2>
                    <p class="lead">
                        Google Chrome，又称Google浏览器，是一个由Google（谷歌）公司开发的网页浏览器。
                        该浏览器是基于其他开源软件所撰写，包括WebKit，目标是提升稳定性、速度和安全性，并创造出简单且有效率的使用者界面。
                    </p>
                </div>
                <div class="col-md-5">
                    <img class="feature-image img-responsive" src="images/chrome-logo.jpg">
                </div>
            </div>
        </div>

        <div class="tab-pane" id="tab-firfox" role="tabpanel">
            <div class="row feature">
                <div class="col-md-5">
                    <img class="feature-image img-responsive" src="images/firefox-logo.jpg">
                </div>
                <div class="col-md-7">
                    <h2 class="feature-heading">Mozilla Firefox <span class="text-muted">美丽的狐狸</span></h2>
                    <p class="lead">Mozilla Firefox，中文名通常称为“火狐”或“火狐浏览器”，是一个开源网页浏览器，
                        使用Gecko引擎（非ie内核），支持多种操作系统如Windows、Mac和linux。</p>
                </div>
            </div>
        </div>

        <div class="tab-pane" id="tab-safari" role="tabpanel">
            <div class="row feature">
                <div class="col-md-7">
                    <h2 class="feature-heading">Safari <span class="text-muted">Mac用户首选</span></h2>
                    <p class="lead">Safari，是苹果计算机的最新操作系统Mac OS X中的浏览器，使用了KDE的KHTML作为浏览器的运算核心。
                        Safari在2003年1月7日首度发行测试版，并成为Mac OS X v10.3与之后的默认浏览器，也是iPhone与IPAD和iPod touch的指定浏览器。</p>
                </div>
                <div class="col-md-5">
                    <img class="feature-image img-responsive" src="images/safari-logo.jpg" alt="Safari">
                </div>
            </div>
        </div>

        <div class="tab-pane" id="tab-opera" role="tabpanel">
            <div class="row feature">
                <div class="col-md-5">
                    <img class="feature-image img-responsive" src="images/opera-logo.jpg" alt="Opera">
                </div>
                <div class="col-md-7">
                    <h2 class="feature-heading">Opera <span class="text-muted">小众但易用</span>
                    </h2>
                    <p class="lead">Opera浏览器，是一款挪威Opera Software ASA公司制作的支持多页面标签式浏览的网络浏览器。
                        是跨平台浏览器可以在Windows、Mac和Linux三个操作系统平台上运行。</p>
                </div>
            </div>
        </div>

        <div class="tab-pane" id="tab-ie" role="tabpanel">
            <div class="row feature">
                <div class="col-md-7">
                    <h2 class="feature-heading">IE <span class="text-muted">你懂的</span></h2>
                    <p class="lead">Internet Explorer，原称Microsoft Internet Explorer(6版本以前)和Windows Internet
                        Explorer(7，8，9，10版本)，
                        简称IE，是美国微软公司推出的一款网页浏览器。它采用的排版引擎(俗称内核)为Trident。</p>
                </div>
                <div class="col-md-5">
                    <img class="feature-image img-responsive" src="images/ie-logo.jpg" alt="IE">
                </div>
            </div>
        </div>
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                    <h4 class="modal-title" id="myModalLabel">关于</h4>
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                    教程内容来源于慕课网
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